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Jonathan Harris

Interleaving Spurs: Letís Look at the Math

Jonathan Harris
jonharris0
jonharris0
9/30/2013 8:02:58 PM
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Re: Re : Interleaving Spurs: Letís Look at the Math
That is correct Sunita.  Now that we've explored the mismatches, I thought it appropriate to start quantifying the level of the spurs caused by these mismatches.

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SunitaT0
SunitaT0
9/30/2013 4:55:22 PM
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Re : Interleaving Spurs: Letís Look at the Math
There are several challenges to look out for while interleaving ADCs.  Spurs appear in the output band that outcomes from the inadequacies related with inter leaving ADCs.  The deficiencies are essentially misalliances between the 2 ADCs that are interleaved.  There are 4 elementary misalliances that outcome in spurs in the production of band.  These are gain mismatch, offset mismatch bandwidth mismatch and timing mismatch.

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More Blogs from Jonathan Harris
We will continue looking at the AD9680 as an example just as we did in part 1. Similar to the real mode operation of the DDC the normalized decimation filter responses are the same regardless of speed grade.
Letís now take a closer look at the decimation filtering and how ADC aliasing influences the effective response of the decimation filtering
Increase the decimation ratio in the DDC to see the effects of frequency folding and translating when a higher decimation rate is employed along with frequency tuning with the NCO.
Letís now take a look at a real example with the AD9680-500. Weíll see how this simple yet powerful tool can be used to aid in understanding the aliasing effects of an ADC as well as help with understanding effects of some digital processing blocks in the AD9680.
Back in my April blog post this year, we took some time to look at the Frequency Folding Tool that is available on the Analog Devices web site. I would like to revisit this tool as there have been a few handy improvements that have been made based on some great feedback.
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